| 1 | |
| 2 |
|
| 3 | #include <linux/compat.h>
|
| 4 | #include <linux/context_tracking.h>
|
| 5 | #include <linux/entry-common.h>
|
| 6 |
|
| 7 | #include <asm/interrupt.h>
|
| 8 | #include <asm/kup.h>
|
| 9 | #include <asm/syscall.h>
|
| 10 | #include <asm/time.h>
|
| 11 | #include <asm/tm.h>
|
| 12 | #include <asm/unistd.h>
|
| 13 |
|
| 14 |
|
| 15 |
|
| 16 | notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
|
| 17 | {
|
| 18 | long ret;
|
| 19 | syscall_fn f;
|
| 20 |
|
| 21 | if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0))) {
|
| 22 | clear_thread_flag(TIF_SYSCALL_RET);
|
| 23 | return syscall_get_error(current, regs);
|
| 24 | }
|
| 25 |
|
| 26 | if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET)))
|
| 27 | return syscall_get_error(current, regs);
|
| 28 |
|
| 29 | if (unlikely(r0 >= NR_syscalls)) {
|
| 30 | if (unlikely(trap_is_unsupported_scv(regs))) {
|
| 31 |
|
| 32 | _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
|
| 33 | return regs->gpr[3];
|
| 34 | }
|
| 35 | return -ENOSYS;
|
| 36 | }
|
| 37 |
|
| 38 |
|
| 39 | barrier_nospec();
|
| 40 |
|
| 41 | #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
|
| 42 | |
| 43 | f = (void *)sys_call_table[r0];
|
| 44 | ret = f(regs);
|
| 45 | #else
|
| 46 | if (unlikely(is_compat_task())) {
|
| 47 | unsigned long r3, r4, r5, r6, r7, r8;
|
| 48 |
|
| 49 | f = (void *)compat_sys_call_table[r0];
|
| 50 |
|
| 51 | r3 = regs->gpr[3] & 0x00000000ffffffffULL;
|
| 52 | r4 = regs->gpr[4] & 0x00000000ffffffffULL;
|
| 53 | r5 = regs->gpr[5] & 0x00000000ffffffffULL;
|
| 54 | r6 = regs->gpr[6] & 0x00000000ffffffffULL;
|
| 55 | r7 = regs->gpr[7] & 0x00000000ffffffffULL;
|
| 56 | r8 = regs->gpr[8] & 0x00000000ffffffffULL;
|
| 57 |
|
| 58 | ret = f(r3, r4, r5, r6, r7, r8);
|
| 59 | } else {
|
| 60 | f = (void *)sys_call_table[r0];
|
| 61 |
|
| 62 | ret = f(regs->gpr[3], regs->gpr[4], regs->gpr[5],
|
| 63 | regs->gpr[6], regs->gpr[7], regs->gpr[8]);
|
| 64 | }
|
| 65 | #endif
|
| 66 |
|
| 67 | return ret;
|
| 68 | }
|